CN109760542A - charging pile control method and controller thereof - Google Patents
charging pile control method and controller thereof Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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Abstract
The invention discloses a charging pile control method and a controller thereof, aiming at solving the technical problem of accurately detecting a fault at the initial stage of the fault during charging of an electric automobile. The invention comprises the following steps: establishing communication connection, setting, sampling, calculating the section to which the temperature, the state of charge, the voltage and the current belong, and judging whether the power battery is in the section to which the power battery belongs. The charging pile controller is provided with a communication management module, a data storage module, a logic control module, a double abnormal protection module and a sampling module. Compared with the prior art, the method adopts slope protection, accurately detects the fault at the initial stage of the fault in the charging process of the electric automobile, reports the fault information to the monitoring system and pushes the fault information to the intelligent mobile phone APP of the automobile owner, and strives for time for operation and maintenance personnel and the automobile owner to process the fault, so that the diffusion of the fault can be effectively inhibited, the accident range is reduced, and even the accident is prevented.
Description
Technical field
The present invention relates to a kind of control method of electric car and its controller, especially a kind of charging of electric car
Control method and its controller.
Background technique
Universal and ownership the growth used with electric car, the safety that electric car uses also become people
Issues that need special attention, and the safety for being ensuring that power battery mostly important in electric car safety.Power battery is made
For the element of high-energy density, once improper use or internal fault occurs, power battery may thermal runaway, if protection is not
In time, in some instances it may even be possible to pyrophoricity accident occur, discovery and excision failure early is to reduce one of the effective way of causality loss.
Electric automobile charging pile all has certain abnormality detection and failure protection function at present, wherein being directed to power battery
Protection generally definite value is used to protect, that is, according to the battery management system BMS of electric car to the specified ginseng of power battery
Several and ability to bear formulates limit value, and have in such as BMS of an electric car for the limit value protection of power battery: highest allows to fill
Piezoelectric voltage limit value, highest allow charging current limit value, maximum permissible temperature limit value.
The process that burning all has one " heat accumulation-thermal runaway-thermal diffusion " occurs for power battery, if can early
It was found that failure, cuts off failure, accident range can be effectively reduced, or even prevent the generation of accident.The charging pile of the prior art
For power battery definite value protection only voltage, electric current and temperature profile amount exceed bound when, can just stop charging and
Shutdown switch, and some failures have come into event in the limit value that not up to definite value is protected in electric car charging process
Hinder quick diffusion phase, the difficulty for causing prevention accident to occur is higher.
Summary of the invention
The object of the present invention is to provide a kind of charging pile control method and its controllers, and technical problems to be solved are can
The initial stage broken down in electric car charging process accurately detects failure.
The invention adopts the following technical scheme: a kind of charging pile control method, comprising the following steps:
One, the battery management system for establishing charging pile controller and electric car communicates to connect, and charging pile controller presses 4Hz
Frequency reads the alarm of the definite value Protection parameters, system parameter, actual parameter, charge requirement and BMS judgement of power battery in real time
State；
Two, charging pile controller sets the work of charging pile according to the charge requirement and definite value Protection parameters of power battery
Mode, protection definite value, charging current instruction value or charging voltage instruction value；
Three, charging pile controller instruction starts to charge；
Four, the sampling of charging pile controller, monitoring real time charging voltage, charging current and charging pipette tips temperature data and charging
The malfunction of stake, all data informations and status information of the power battery that battery management system uploads；
Five, calculate temperature of powered cell should belong to section；
Six, judge whether the temperature of power battery is in temperature and should belong in section, if temperature should not belong to section in temperature
It is interior, stop charging immediately, the fault-signal of temperature anomaly is reported to charging pile operation management system；If temperature should belong in temperature
In section, continue to charge；
Seven, calculate power battery charged state should belong to section；
Eight, judge whether the state-of-charge of power battery is in state-of-charge and should belong in section, if state-of-charge does not exist
State-of-charge should belong in section, stop charging immediately, the fault-signal of temperature anomaly is reported to charging pile operation management system；Such as
Fruit state-of-charge should belong in section in state-of-charge, continue to charge；
Nine, calculate the charging voltage of power battery should belong to section；
Ten, judge whether the charging voltage of power battery is in voltage and should belong in section, if charging voltage is not in voltage
It should belong in section, stop charging immediately, the fault-signal of temperature anomaly is reported to charging pile operation management system；If charging electricity
Being pressed in voltage should belong in section, continue to charge；
11, calculate the charging current of power battery should belong to section；
12, judge whether the charging current of power battery is in electric current and should belong in section, if charging current is not in electricity
Stream should belong in section, stop charging immediately, the fault-signal of temperature anomaly is reported to charging pile operation management system；If charging
Electric current should belong in section in electric current, continue to charge, then calculate judgement by step 5, until charging terminates.
Definite value Protection parameters are that highest allows total voltage, highest that monomer voltage, highest is allowed to permit in step one of the invention
Perhaps charging current, maximum permissible temperature；The system parameter be power battery rated capacity, specified total voltage, total nominal energy,
Temperature definite value guard interval；The actual parameter is the initial state-of-charge of power battery, maximum temperature, minimum temperature, highest list
Bulk voltage, ceiling voltage number, maximum temperature number, minimum temperature number, abnormality alarming state, current, residue charging time；
The charge requirement is electric car charging current instruction value or charging voltage instruction value；The announcement of the battery management system judgement
Alert state is electric voltage exception definite value bound setting value, current anomaly definite value bound setting value.
Operating mode is constant current charging mode and constant-voltage charge mode in step two of the invention；The protection definite value is single
Body maximum charging voltage, highest allow charging current, highest to allow charge total voltage, maximum permissible temperature.
Step four data information of the invention is that the highest of power battery allows total voltage, highest to allow monomer voltage, most
Height allow charging current, maximum permissible temperature, rated capacity, specified total voltage, total nominal energy, temperature definite value guard interval,
Initially, real-time voltage, real-time current, real time temperature, charging current instruction value, charging voltage instruction value, charging time, the highest temperature
Degree, minimum temperature, highest monomer voltage, ceiling voltage number, maximum temperature number, minimum temperature number, current state-of-charge,
The remaining charging time；The status information is the abnormality alarming state of power battery.
Step five calculating temperature of powered cell of the invention should belong to section, comprising the following steps:
(1) in real time read charging pile charging current, in conjunction with battery management system acquire power battery real time temperature,
Calculate real-time power battery acceptable temperature anomaly slope upper limit setting k during the charging processt_maxWith lower limit set kt_min,
kt_min_n=-0.5 (DEG C/min) (2)
In formula (1) and formula (2), kt_max_nIt is n-th of moment temperature anomaly slope upper limit, kt_min_nIt is n-th of moment temperature
Abnormal slope lower limit, Ic_nIt is the charging current at n-th of moment, INIt is the specified charging current of power battery, 0.5 is adjustment system
Number；
K is set with the temperature anomaly slope upper limitt_maxWith lower limit set kt_minSlope guard interval as temperature change
[Tk_min, Tk_max], had according to linear superposition theorem y=kx+b:
Tk_max_n=Tn-1+kt_max_n×(tn-tn-1)(℃) (3)
Tk_min_n=Tn-1+kt_min_n×(tn-tn-1)(℃) (4)
In formula (3) and formula (4), Tk_max_nIt is the temperature upper limit of n-th of moment exception slope protection, Tk_min_nWhen being n-th
Carve the lowest temperature of abnormal slope protection, Tn-1It is the temperature of (n-1)th moment power battery, tnRefer to n-th of moment, tn-1It is
Refer to (n-1)th moment；
(2) the acceptable highest battery temperature T for uploading the battery management system communication of power batteryc_maxWith minimum battery
Temperature Tc_minAs temperature anomaly definite value upper and lower limit, it is set as the definite value protection temperature range [T of power batteryc_min, Tc_max]；
(3) by the slope guard interval [T of temperature changek_min, Tk_max] and definite value protection temperature range [Tc_min, Tc_max]
It is compared calculating, by [Tk_min, Tk_max] and [Tc_min, Tc_max] both be overlapped section as power battery in charging process
Temperature should belong to section [Tmin, Tmax]。
6. charging pile control method according to claim 1, which is characterized in that the step 7 calculates power battery
State-of-charge should belong to section, comprising the following steps:
(1) the ampere-hour capacity increment of power battery charging is calculated:
In formula (5),Refer to from t0To tnThe charging ampere-hour capacity increment of power battery, t0When referring to charging starting
It carves, Ic(t) refer to the charging current of t moment；
tnThe state of charge of moment power battery:
In formula (6),Refer to tnThe state-of-charge numerical value of moment power battery,Refer to t0The lotus of moment power battery
Electricity condition numerical value,Refer to from t0To tnThe state-of-charge increment of power battery, ENRefer to that the specified ampere-hour of power battery is held
Amount；
The variation slope of power battery charged state are as follows:
In formula (7), Ic(tn) refer to tnThe charging current at moment；
T is calculatednThe upper limit of moment state-of-charge exception slopeAnd lower limitAre as follows:
In formula (8) and formula (9), ecFor the current sample error of charging pile, ebFor the current sample point tolerance of power battery,
esFor charging pile current sample point it is different from the current sample of power battery point position caused by error,
According to tnThe upper limit of moment state-of-charge exception slopeAnd lower limitCalculate tnMoment is abnormal
The SOC upper limit of slope protectionAnd lower limit
In formula (10) and formula (11),It is tnThe state-of-charge upper limit of moment exception slope protection,
It is tnThe SOC lower limit of moment exception slope protection, ks_maxIt (t) is the t moment power battery charged state exception slope upper limit,
ks_mminIt (t) is t moment power battery charged state exception slope lower limit；
With power battery charged state exception slope upper limit ks_maxWith lower limit ks_mminSlope protection zone as temperature change
Between [Sk_min, Sk_max]；
(2) by the state-of-charge exception definite value bound of power battery, it is set as section state-of-charge (SOC) of definite value protection
[Sc_min, Sc_max]；
(3) the state-of-charge section in the state-of-charge section of slope protection and definite value protection is compared calculating, weight
The section of conjunction should belong to section [S as the state-of-charge of power battery in charging processmin, Smax]。
7. charging pile control method according to claim 1, which is characterized in that the step 9 calculates power battery
Charging voltage should belong to section, comprising the following steps:
(1) highest of power battery is allowed into total voltage and minimum permission voltage, the electricity as the protection of electric voltage exception definite value
[V between pressure areac_min, Vc_max]；
(2) judge that power battery is in constant current charging mode, calculating power battery, voltage can under constant current charging mode
The variation slope upper limit k of receivingv_maxWith slope lower limit kv_min；
The variation slope k of power battery voltagev_nAre as follows:
In formula (12), V (i+1) indicates that the voltage of i+1 moment power battery, V (i) indicate i-th of moment power electric
The voltage in pond, m are the sample frequency of voltage；
Setting voltage change slope lower limit is kv_min=0, voltage change slope upper limit kv_max_nAre as follows:
In formula (13), Δ t refers to the time interval of power battery voltage sample, and Δ SOC refers to power battery in the Δ t time
The variable quantity of interior SOC, Ic(n) refer to the charging current at n-th of moment, ENRefer to the specified ampere-hour capacity of power battery；
The upper voltage limit V that power battery is protected in n-th of moment slopek_max_nWith lower limit Vk_min_nIt is respectively as follows:
Vk_max_n=Vn-1+kv_max_n×Δt(V)； (14)
Vk_min_n=Vn-1+kv_min× Δ t=Vn-1(V) (15)
In formula (14) and formula (15), Vn-1 is the voltage sample value at (n-1)th moment,
By upper voltage limit Vk_max_nWith lower limit Vk_min_nVoltage range [V as slope protectionk_min, Vk_max]；
(3) voltage range for voltage range and the slope protection protected electric voltage exception definite value, is compared calculating, weight
The section of conjunction should belong to section [V as the voltage of power battery in charging processmin, Vmax]。
8. charging pile control method according to claim 1, which is characterized in that the step 11 calculates power electric
The charging current in pond should belong to section, comprising the following steps:
(1) the electric current section for allowing charging current and minimum charging current to protect as definite value the highest of power battery
[Ic_min, Ic_max]；
(2) judge that power battery is in constant-voltage charge mode, the variation slope k of power battery electric currenti_nAre as follows:
In formula (16), I (i+1) indicates that the electric current of i+1 moment power battery, I (i) indicate i-th of moment power electric
The electric current in pond；
Curent change slope upper limit k is seti_max=0；The upper current limit I of slope protectionk_max_nWith the electric current of slope protection
Lower limit Ik_min_nAre as follows:
Ik_max_n=In-1+ki_max_n× Δ t=In-1 (17)
Ik_min_n=0
The upper current limit I that slope is protectedk_max_nWith the lower current limit I of slope protectionk_min_nElectric current as slope protection
Section [Ik_min, Ik_max]；
(3) by the electric current section in the electric current section of definite value protection and slope protection, it is compared calculating, the section of coincidence
Electric current as power battery in charging process should belong to section [Imin, Imax]。
A kind of charging pile controller is equipped with communication management module, data memory module, Logic control module, dual exception
Protective module and sampling module；
The communication management module is used to carry out the data of power battery and the state parameter of charging pile unitized management；
The data are that battery management system uploads to the highest of charging pile controller total voltage, highest is allowed to allow monomer voltage, most
Height allow charging current, maximum permissible temperature, rated capacity, specified total voltage, total nominal energy, temperature definite value guard interval,
When initial state-of-charge, real-time voltage, real-time current, real time temperature, charging current instruction value, charging voltage instruction value, charging
Between, it is maximum temperature, minimum temperature, highest monomer voltage, ceiling voltage number, maximum temperature number, minimum temperature number, abnormal
Alarm status, current state-of-charge, remaining charging time；The state parameter be charging voltage, charging current, switch state,
Malfunction；
The data memory module is for storing charge information data, convenient for the data traceability for the unusual condition that charges
And analysis；The charge information data are that the highest of power battery allows total voltage, highest that monomer voltage, highest is allowed to allow to fill
Electric current, maximum permissible temperature, rated capacity, specified total voltage, total nominal energy, temperature definite value guard interval, initial S are charged
State, real-time voltage, real-time current, real time temperature, charging current instruction value, charging voltage instruction value, charging time, the highest temperature
Degree, minimum temperature, highest monomer voltage, ceiling voltage number, maximum temperature number, minimum temperature number, abnormality alarming state,
Current state-of-charge, the charging voltage in remaining charging time and charging pile, charging current, charging pipette tips temperature, malfunction；
The charging current instruction value and charging that the Logic control module is issued according to the battery management system of power battery
Voltage instruction value instruction, the power output of real-time control charging module；
The dual abnormal protection module realizes the detection of characteristic quantity anomaly trend and breakdown judge in charging process；
The sampling module real-time monitoring charging pile charging voltage, charging current and charging pipette tips temperature data information.
Charging pile controller of the invention is equipped with encryption authentication module, metering and billing module, power module and narration information
Active push module；
The encryption authentication module is used to carry out body to the charging pile operation management system unit of charging pile communication interaction
Part certification, and the data of communication interaction are encrypted；
The metering and billing module is used to count the information about power in charging process；
The power module provides reliable and stable power supply supply for charging pile controller；
The fault message active push module is by the mobile phone of fault message active push to car owner.
Compared with prior art, the present invention by calculate power battery during the charging process the temperature of power battery, SOC,
Whether voltage and current variation slope is in normal interval, is protected using slope, event occurs in electric car charging process
The initial stage accurate detection failure of barrier by fault information reporting to monitoring system and pushes in the smart phone APP of car owner, is
Operation maintenance personnel and car owner's handling failure are raced against time, so that it may which the effective diffusion for inhibiting failure reduces accident range, or even resistance
The only generation of accident.
Detailed description of the invention
Fig. 1 is that charging pile connect charging schematic diagram with electric car.
Fig. 2 is control method flow chart of the invention.
Fig. 3 is that temperature of powered cell should belong to interval computation method schematic diagram in charging process of the invention.
Fig. 4 is that power battery SOC should belong to interval computation method schematic diagram in charging process of the invention.
Fig. 5 is that power battery voltage should belong to interval computation method schematic diagram in charging process of the invention.
Fig. 6 is voltage and SOC relation schematic diagram during power battery charging.
Fig. 7 is that power battery electric current should belong to interval computation method schematic diagram in charging process of the invention.
Fig. 8 is charging pile controller architecture schematic diagram of the invention.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and examples.
As shown in Figure 1, the charging pile vehicle interface charged with electric car is connect, electronic vapour when electric car charges
The state-of-charge SOC data of power battery are uploaded to charging pile controller by the BMS of vehicle.Charging pile controller completes voltage, electricity
Three-phase incoming power switch K0, charge switch K1, K2 after the parameter setting of stream and time on control closure charging pile, BMS control
Charge switch K5, K6 on system closure electric car, charging pile controller indicate charging module work, fill to electric car
Electricity.During the charging process, the voltage of charging pile controller real-time monitoring charging pile and power battery, electric current and temperature profile amount number
According to, once discovery failure A-stage value, charging module is immediately controlled and stops working, shutdown related switch K0, K1, K2, K5,
K6。
As shown in Fig. 2, charging pile control method of the invention, comprising the following steps:
One, the BMS for establishing charging pile controller and electric car is communicated to connect, and charging pile controller is real-time by 4Hz frequency
Read the related alarm status that definite value Protection parameters, system parameter, actual parameter, the charge requirement of power battery judge to BMS.
Definite value Protection parameters are that highest allows total voltage, highest to allow monomer voltage, highest that charging current, highest is allowed to permit
Perhaps temperature.
System parameter is power battery rated capacity, specified total voltage, total nominal energy, temperature definite value guard interval.
Actual parameter is the initial SOC of power battery, maximum temperature, minimum temperature, highest monomer voltage, ceiling voltage are compiled
Number, maximum temperature number, minimum temperature number, abnormality alarming state, current SOC, remaining charging time.
Charge requirement is electric car charging current instruction value or charging voltage instruction value.
The related alarm status that BMS judges sets as electric voltage exception definite value bound setting value, current anomaly definite value bound
Definite value.
Two, charging pile controller sets the work of charging pile according to the charge requirement and definite value Protection parameters of power battery
Mode, protection definite value, charging current instruction value or charging voltage instruction value.
Operating mode be constant current charging mode and constant-voltage charge mode, operating mode by power battery batteries of electric automobile
Management system after communicating with charging pile controller by setting.
Protection definite value is monomer maximum charging voltage, highest allows charging current, highest that charging total voltage, highest is allowed to permit
Perhaps temperature, specific value is by the battery management system of power battery by setting after communicating with charging pile controller.
Charging current instruction value by power battery battery management system by after being communicated with charging pile controller by battery
The demand charging current value that management system uploads directly is set.
Charging voltage instruction value by power battery battery management system by after being communicated with charging pile controller by battery
The demand charging voltage value that management system uploads directly is set.
Three, charging pile controller control closure three-phase incoming power switch K0, charge switch K1, K2, BMS control closure electricity
Charge switch K5, K6 on electrical automobile, control charging module are started to charge by the operating mode set, instruction.
Four, the sampling of charging pile controller, monitoring real time charging voltage, charging current and charging pipette tips temperature data and charging
The malfunction of stake, all data informations and status information of the power battery that BMS is uploaded.
Data information be power battery highest allow total voltage, highest allow monomer voltage, highest allow charging current,
Maximum permissible temperature, rated capacity, specified total voltage, total nominal energy, temperature definite value guard interval, initial SOC, in real time electricity
Pressure, real-time current, real time temperature, charging current instruction value, charging voltage instruction value, charging time, maximum temperature, lowest temperature
Degree, highest monomer voltage, ceiling voltage number, maximum temperature number, minimum temperature number, current SOC, remaining charging time.
Status information is the abnormality alarming state of power battery.
Five, calculate temperature of powered cell should belong to section, as shown in Figure 3, comprising the following steps:
(1) in real time read charging pile charging current, in conjunction with electric car BMS acquire power battery real time temperature,
Calculate real-time power battery acceptable temperature anomaly slope upper limit setting k during the charging processt_maxWith lower limit set kt_min,
Temperature anomaly slope upper and lower bound is variation, and the slope at each moment is related with charging current this moment.
kt_min_n=-0.5 (DEG C/min) (2)
In formula (1) and formula (2), kt_max_nIt is n-th of moment temperature anomaly slope upper limit, kt_min_nIt is n-th of moment temperature
Abnormal slope lower limit, Ic_nIt is the charging current at n-th of moment, INIt is the specified charging current of power battery, 0.5 is adjustment system
Number statisticallys analyze to obtain for applicant according to a large amount of charge datas.
K is set with the temperature anomaly slope upper limitt_maxWith lower limit set kt_minSlope guard interval as temperature change
[Tk_min, Tk_max].Had according to linear superposition theorem y=kx+b:
Tk_max_n=Tn-1+kt_max_n×(tn-tn-1)(℃) (3)
Tk_min_n=Tn-1+kt_min-n×(tn-tn-1)(℃) (4)
In formula (3) and formula (4), Tk_max_nIt is the temperature upper limit of n-th of moment exception slope protection, Tk_min_nWhen being n-th
Carve the lowest temperature of abnormal slope protection, Tn-1It is the temperature of (n-1)th moment power battery, tnRefer to n-th of moment, tn-1It is
Refer to (n-1)th moment.
(2) by temperature definite value protected mode in prior art charging process, the battery management system of power battery is communicated
The acceptable highest battery temperature T uploadedc_maxWith minimum battery temperature Tc_minAs temperature anomaly definite value upper and lower limit, it is set as
The definite value of power battery protects temperature range [Tc_min, Tc_max]。
(3) by the slope guard interval [T of temperature changek_min, Tk_max] and definite value protection temperature range [Tc_min, Tc_max]
It is compared calculating, by [Tk_min, Tk_max] and [Tc_min, Tc_max] both be overlapped section as power battery in charging process
Temperature should belong to section [Tmin, Tmax]。
Six, judge whether the temperature of power battery is in temperature and should belong in section, if temperature should not belong to section in temperature
It is interior, stop charging immediately, the fault-signal of temperature anomaly is reported to charging pile operation management system；If temperature should belong in temperature
In section, continue to charge.
Seven, calculate power battery SOC should belong to section, as shown in Figure 4, comprising the following steps:
(1) the ampere-hour capacity increment that power battery charging is calculated according to ampere-hour accumulation method, i.e., charging in power battery
In the process, the charging ampere-hour capacity increment (integral) of real time charging electric current and charging time:
In formula (5),Refer to from t0To tnThe charging ampere-hour capacity increment of power battery, t0When referring to charging starting
It carves, Ic(t) refer to the charging current of t moment.
tnThe SOC value of moment power battery:
In formula (6),Refer to tnThe SOC numerical value of moment power battery,Refer to t0The SOC numerical value of moment power battery,Refer to from t0To tnThe SOC increment of power battery, ENThe specified ampere-hour capacity for referring to power battery, by the electricity of power battery
Pond management system is given.
The variation slope of power battery SOC are as follows:
In formula (7), Ic(tn) refer to tnThe charging current at moment.
Due to the current sample of the BMS of the charge current sample and power battery of charging pile node location and precision not
Together, SOC can have certain deviation.Charging pile current sample precision is ec, the current sample precision of the BMS of power battery is eb,
Deviation caused by sampling location is es, after this deviation is added, t can be calculatednThe upper limit of moment SOC exception slopeAnd lower limitAre as follows:
In formula (8) and formula (9), ecIt, can adopting by charging pile current sample element for the current sample error of charging pile
Sample precision obtains, ebFor the current sample error of power battery, can be obtained by the sampling precision of power battery current sample element
, esFor charging pile current sample point it is different from the current sample of power battery point position caused by error, by 1% calculate.
According to tnThe upper limit of moment SOC exception slopeAnd lower limitCalculate tnMoment exception slope
The SOC upper limit of protectionAnd lower limit
In formula (10) and formula (11),It is tnThe SOC upper limit of moment exception slope protection,It is tnWhen
Carve the SOC lower limit of abnormal slope protection, ks_maxIt (t) is the t moment power battery SOC exception slope upper limit, ks_mminIt (t) is t moment
Power battery SOC exception slope lower limit.
With power battery SOC exception slope upper limit ks_maxWith lower limit ks_mminSlope guard interval as temperature change
[Sk_min, Sk_max]。
(2) the definite value protection of power battery SOC is protected after power battery is fully charged, to stop the anti-overshoot of charging immediately
Shield.In view of charging pile only does charging operations to power battery, the SOC of power battery is answered in rising trend in charging, therefore will
The SOC exception definite value bound of power battery is set as the section the SOC [S of definite value protectionc_min, Sc_max], be set as [0,
100%].
(3) section SOC in the section SOC of slope protection and definite value protection is compared calculating, the section of coincidence is made
Section [S should be belonged to for the SOC of power battery in charging processmin, Smax]。
Eight, judge whether the SOC of power battery is in SOC and should belong in section, if SOC should not belong in section in SOC, stand
Stop charging, the fault-signal of temperature anomaly is reported to charging pile operation management system；If SOC should belong in section in SOC,
Continue to charge.
Nine, calculate the charging voltage of power battery should belong to section, as shown in Figure 5, comprising the following steps:
(1) by voltage definite value protected mode in prior art charging process, by the electric car BMS power battery uploaded
Highest allows total voltage and minimum permission voltage, the voltage range [V as the protection of electric voltage exception definite valuec_min, Vc_max]。
(2) judge whether power battery is in constant current charging mode, according to power battery rated capacity, and combine and fill in real time
The real-time SOC state of electric current and power battery calculates power battery acceptable variation of voltage under constant current charging mode
Slope upper limit kv_maxWith slope lower limit kv_min。
When power battery is in constant-voltage charge, power battery voltage is determined by the output voltage of charging pile, power battery
The variation of voltage almost can be ignored, and if there is the situation that power battery voltage change is larger, significantly voltage becomes
Change the moment impact that can cause charging current, directly triggers charging module in charging pile and instantaneous overcurrent protection occur.And power electric
The slope protection of cell voltage can not be acted since response speed is slower before the instantaneous overcurrent of charging module is protected, therefore not applicable
Power battery slope protection under constant voltage mode of the invention.
When power battery is in constant-current charge, the voltage of power battery is constantly in ascendant trend, due to charging pile
The presence of error and sampling error is controlled, excessively high sample frequency can make the oblique of power battery voltage change during the charging process
There is the case where positive and negative alternating in rate, and too low sample frequency will affect the timely detection of failure, can pass through moving average method
Power battery voltage change slope is calculated, to reduce the influence of error, the time window of moving average method is set as 2 seconds.
Moving average method are as follows: assuming that the sample frequency of power battery voltage is m hertz, i.e., the time window of 2 seconds sliding averages
Inside there is 2 × m sampling changing value, m 4Hz, then n-th of moment, the variation slope k of power battery voltagev_nAre as follows:
In formula (12), V (i+1) indicates that the voltage of i+1 moment power battery, V (i) indicate i-th of moment power electric
The voltage in pond.
Voltage based on power battery in charging process will not reduce, so setting voltage change slope lower limit is kv_min=
0.During power battery charging, there is approximate piecewise linear relationship, such as Fig. 6 in the SOC of power battery voltage and power battery
It is shown, power battery during the charging process, the relationship of SOC piecewise linearity approximate with voltage presentation, can be divided into " rise-it is steady-
Rise " three phases, three phases are separation with inflection point one and inflection point two.In first transition, power battery voltage can be with
The increase rapid increase of SOC, and in steady section, power battery voltage is very low with the increased rate of rise of SOC.Application
N-th of moment voltage change slope upper limit k is arranged by a large amount of data statistics and analysis in peoplev_max_nAre as follows:
In formula (13), Δ t refers to the time interval of power battery voltage sample, and Δ SOC refers to power battery in the Δ t time
The variable quantity of interior SOC, Ic(n) refer to the charging current at n-th of moment, ENThe specified ampere-hour capacity for referring to power battery, by power
The battery management system of battery is given.
According to linear superposition theorem y=kx+b, the upper voltage limit V that power battery is protected in the n-th moment slope is obtainedk_max_n
With lower limit Vk_min_nIt is respectively as follows:
Vk_max_n=Vn-1+kv_max_n×Δt(V)； (14)
Vk_min_n=Vn-1+kv_min× Δ t=Vn-1(V) (15)
In formula (14) and formula (15), Vn-1 is the voltage sample value at (n-1)th moment, is provided by sampling circuit.
Vk_minIt is to change with time change, i.e., the V at n-th momentk_minIt is exactly Vk_min_n；Vk_maxBe also with
Time change and change, i.e., the V at n-th momentk_maxIt is exactly Vk_max_n。[Vk_min, Vk_max] for during the charging process sometimes
Carve [Vk_min_n, Vk_max_n] set.By upper voltage limit Vk_max_nWith lower limit Vk_min_nThe voltage zone protected as slope of set
Between [Vk_min, Vk_max]。
(3) voltage range for voltage range and the slope protection protected electric voltage exception definite value, is compared calculating, weight
The section of conjunction should belong to section [V as the voltage of power battery in charging processmin, Vmax]。
Ten, judge whether the charging voltage of power battery is in voltage and should belong in section, if charging voltage is not in voltage
It should belong in section, stop charging immediately, the fault-signal of temperature anomaly is reported to charging pile operation management system；If charging electricity
Being pressed in voltage should belong in section, continue to charge.
11, calculate the charging current of power battery should belong to section, as shown in fig. 7, comprises following steps:
(1) by current ration protected mode in prior art charging process, by the electric car BMS power battery uploaded
Electric current section [the I that highest allows charging current and minimum charging current to protect as definite valuec_min, Ic_max]。
(2) judge whether power battery is in constant-voltage charge mode, when power battery is in constant-current charge, power battery
Electric current is determined that the variation of power battery electric current almost can be ignored, if there is power electric by the output voltage of charging pile
The larger situation of pond curent change, significantly curent change can cause the moment impact of charging voltage, directly triggering charging pile
Middle charging module instantaneous overvoltage protection, and the slope of power battery electric current is protected since response speed is slower, it can not be in charging mould
Movement before the instantaneous overvoltage protection of block, therefore the slope for the power battery electric current being not suitable under constant current mode of the invention is protected.
When power battery is in constant-voltage charge, the electric current of power battery should be constantly in downward trend, but due to charging
The presence of the control error and sampling error of stake, excessively high sample frequency can make power battery curent change during the charging process
Slope occur it is positive and negative alternately the case where, and too low sample frequency will affect the timely detection of failure, can be flat by sliding
Equal method calculates power battery voltage change slope, and to reduce the influence of error, the time window of moving average method is set as 2 seconds.
Moving average method are as follows: assuming that the sample frequency of power battery electric current is m hertz, i.e., the time window of 2 seconds sliding averages
Inside there is 2 × m sampling changing value, then n-th of moment, the variation slope k of power battery electric currenti_nAre as follows:
In formula (16), I (i+1) indicates that the electric current of i+1 moment power battery, I (i) indicate i-th of moment power electric
The electric current in pond.
Electric current based on power battery during constant-voltage charge will not increase, so setting curent change slope upper limit ki_max
=0.Since electric current is difficult to acquire power battery in constant-voltage charge mode, and the speed that electric current declines in constant-voltage charge mode
Degree is fast, can quickly reduce the charge power of charging pile, is more nearly charging pile protection and shuts down the state that output power is zero.Therefore not
Strictly setting charging current changes slope lower limit k againi_minCalculation formula.According to linear superposition theorem y=kx+b, power is obtained
The upper current limit I that battery is protected in n-th of moment slopek_max_nWith the lower current limit I of slope protectionk_min_nAre as follows:
Ik_max_n=In-1+ki_max_n× Δ t=In-1(A) (17)
Ik_min_n=0 (A) stops charging.
Ik_minIt is to change with time change, i.e., the I at n-th momentk_minIt is exactly Ik_min_n；Ik_maxBe also with
Time change and change, i.e., the I at n-th momentk_maxIt is exactly Ik_max_n。[Ik_min, Ik_max] for during the charging process sometimes
Carve [Ik_min_n, Ik_max_n] set.The upper current limit I that slope is protectedk_max_nWith the lower current limit I of slope protectionk_min_n's
Gather the electric current section [I protected as slopek_min, Ik_max]。
(3) by the electric current section in the electric current section of definite value protection and slope protection, it is compared calculating, the section of coincidence
Electric current as power battery in charging process should belong to section [Imin, Imax]。
12, judge whether the charging current of power battery is in electric current and should belong in section, if charging current is not in electricity
Stream should belong in section, stop charging immediately, the fault-signal of temperature anomaly is reported to charging pile operation management system；If charging
Electric current should belong in section in electric current, continue to charge, then calculate judgement by step 5, until charging terminates.
If temperature, SOC, voltage, electric current work on two boundaries that should belong to section, not reporting fault.
Method of the invention, in electric car charging process, for the temperature of power battery, SOC, voltage, curent change,
Carry out slope protection, slope protection be by calculate power battery during the charging process the temperature of power battery, SOC, voltage and
Whether curent change slope is in normal interval, come judge in charging process whether faulty generation, if variation slope is super
Normal interval out, charging pile stop charging immediately.Since there are the processes that an anomalous variation is accumulated for the failure of power battery, and
Slope can directly react the trend of this anomalous variation, so protecting relative to definite value, slope is protected for anomalous variation
Sensibility is higher, it is easier to detect exception at failure initial stage.
As shown in fig. 7, charging pile controller of the invention, is equipped with encryption authentication module, communication management module, data storage
Module, metering and billing module, Logic control module, dual abnormal protection module, power module, sampling module and narration information master
Dynamic pushing module.
Encryption authentication module is used to recognize with the charging pile operation management system unit of charging pile communication interaction progress identity
Card, and the data of communication interaction are encrypted, prevent charge capacity, the charging electricity charge, charging time, charging voltage, charging electricity
Stream and fault state data information are tampered, and ensure the safe and reliable of communication.
Communication management module is used to carry out the data of power battery and the state parameter of charging pile unitized management.
Data are that battery management system uploads to the highest permission total voltage of charging pile controller, highest permission monomer electricity
Pressure, highest allow charging current, maximum permissible temperature, rated capacity, specified total voltage, total nominal energy, temperature definite value to protect
When section, initial SOC, real-time voltage, real-time current, real time temperature, charging current instruction value, charging voltage instruction value, charging
Between, it is maximum temperature, minimum temperature, highest monomer voltage, ceiling voltage number, maximum temperature number, minimum temperature number, abnormal
Alarm status, current SOC, remaining charging time.
State parameter is charging voltage, charging current, switch state, malfunction.
Unitized management is that data and state are summarized and classified, and is sent to metering and billing module, logic control mould
Block, multiple abnormal protection module, data memory module, fault message active push module and charging pile operational management platform.
Communication management module is responsible for the work of step 1 in method of the invention.
Data memory module for being stored to charge information data, convenient for the unusual condition that charges data traceability and point
Analysis.
Charge information data are that the highest of power battery allows total voltage, highest that monomer voltage, highest is allowed to allow to charge
Electric current, maximum permissible temperature, rated capacity, specified total voltage, total nominal energy, temperature definite value guard interval, initial SOC, reality
When voltage, real-time current, real time temperature, charging current instruction value, charging voltage instruction value, the charging time, maximum temperature, minimum
It is temperature, highest monomer voltage, ceiling voltage number, maximum temperature number, minimum temperature number, abnormality alarming state, current
SOC, the charging voltage in remaining charging time and charging pile, charging current, charging pipette tips temperature, malfunction.
Metering and billing module is used to count the information about power in charging process, is convenient for charge calculation.
The charging current instruction value and charging voltage that Logic control module is issued according to the battery management system of power battery
Instruction value instruction, the power output of real-time control charging module meet charge requirement.
Logic control module is responsible for the work of step 3 in method of the invention.
Dual abnormal protection module has definite value protection, slope protects two kinds of abnormity protection functions, realizes in charging process
The detection of characteristic quantity anomaly trend and breakdown judge.
The step of dual abnormal protection module is responsible for the method for the present invention two, Step 4: Step 5: Step 6: Step 7: step
Rapid eight, Step 9: Step 10: the Step 11: work of step 12.
Power module provides reliable and stable power supply supply for charging pile controller, guarantees that each functional module works normally.
Sampling module, real-time monitoring charging pile charging voltage, charging current and charging pipette tips temperature data information, are logic
Control and abnormal protection provide data supporting.
Fault message active push module can assist the cell phone application of fault message active push to car owner convenient for car owner
Help the timely handling failure of operation maintenance personnel.
It is specified to read the power battery correlation that electric car BMS is uploaded after charging pile is connect with electric car by the present invention
Parameter, Protection parameters and virtual condition, the sampling of the charging voltage, charging current parameter of combined charge stake itself calculate in real time
Temperature of powered cell, SOC, voltage and current characteristic quantity definite value guard interval and slope guard interval, calculated by coincidence
To the multiple abnormal protection section of power battery characteristic quantity.When the real time data of the characteristic quantity of power battery is protected beyond dual exception
When protecting section, the unusual condition in electric car charging process can be found in time, stop charging, shutdown charge switch immediately,
Fault warning information is provided, the timely handling failure of operation maintenance personnel is reminded, races against time to eliminate failure, advantageously reduces failure model
Enclose and prevent accident.
Claims (10)
1. a kind of charging pile control method, comprising the following steps:
One, the battery management system (BMS) for establishing charging pile controller and electric car communicates to connect, and charging pile controller is pressed
4Hz frequency reads definite value Protection parameters, system parameter, actual parameter, charge requirement and the battery management system of power battery in real time
The alarm status of system (BMS) judgement；
Two, charging pile controller is according to the charge requirement and definite value Protection parameters of power battery, set charging pile operating mode,
Protect definite value, charging current instruction value or charging voltage instruction value；
Three, charging pile controller instruction starts to charge；
Four, the sampling of charging pile controller, monitoring real time charging voltage, charging current and charging pipette tips temperature data and charging pile
Malfunction, all data informations and status information of the power battery that battery management system (BMS) uploads；
Five, calculate temperature of powered cell should belong to section；
Six, judge whether the temperature of power battery is in temperature and should belong in section, if temperature should not belong in section in temperature, stand
Stop charging, the fault-signal of temperature anomaly is reported to charging pile operation management system；If temperature should belong to section in temperature
It is interior, continue to charge；
Seven, calculate power battery charged state (SOC) should belong to section；
Eight, judge whether the state-of-charge (SOC) of power battery should belong in section in state-of-charge (SOC), if charged shape
State (SOC) should not belong in section in state-of-charge (SOC), stop charging immediately, report temperature to charging pile operation management system
Abnormal fault-signal；If state-of-charge (SOC) should belong in section in state-of-charge (SOC), continue to charge；
Nine, calculate the charging voltage of power battery should belong to section；
Ten, judge whether the charging voltage of power battery is in voltage and should belong in section, if charging voltage should not belong in voltage
In section, stops charging immediately, the fault-signal of temperature anomaly is reported to charging pile operation management system；If charging voltage exists
Voltage should belong in section, continue to charge；
11, calculate the charging current of power battery should belong to section；
12, judge whether the charging current of power battery is in electric current and should belong in section, if charging current is not answered in electric current
Belong in section, stops charging immediately, the fault-signal of temperature anomaly is reported to charging pile operation management system；If charging current
It should belong in section in electric current, continue to charge, then calculate judgement by step 5, until charging terminates.
2. charging pile control method according to claim 1, which is characterized in that definite value Protection parameters are in the step 1
Highest allows total voltage, highest that monomer voltage, highest is allowed to allow charging current, maximum permissible temperature；The system parameter is
Power battery rated capacity, specified total voltage, total nominal energy, temperature definite value guard interval；The actual parameter is power electric
The initial state-of-charge in pond (SOC), maximum temperature, minimum temperature, highest monomer voltage, ceiling voltage are numbered, maximum temperature is numbered,
Minimum temperature number, abnormality alarming state, current state-of-charge (SOC), remaining charging time；The charge requirement is electronic vapour
Vehicle charging current instruction value or charging voltage instruction value；The alarm status that the battery management system (BMS) judges is different as voltage
Normal definite value bound setting value, current anomaly definite value bound setting value.
3. charging pile control method according to claim 1, which is characterized in that operating mode is constant current in the step 2
Charge mode and constant-voltage charge mode；The protection definite value is monomer maximum charging voltage, highest allows charging current, highest permits
Perhaps charge total voltage, maximum permissible temperature.
4. charging pile control method according to claim 1, which is characterized in that the step 4 data information is power electric
The highest in pond allows total voltage, highest that monomer voltage, highest is allowed to allow charging current, maximum permissible temperature, rated capacity, volume
Determine total voltage, total nominal energy, temperature definite value guard interval, initial state-of-charge (SOC), real-time voltage, real-time current, in real time
Temperature, charging current instruction value, charging voltage instruction value, charging time, maximum temperature, minimum temperature, highest monomer voltage, most
High voltage number, maximum temperature number, minimum temperature number, current state-of-charge (SOC), remaining charging time；The state
Information is the abnormality alarming state of power battery.
5. charging pile control method according to claim 1, which is characterized in that the step 5 calculates temperature of powered cell
Should belong to section, comprising the following steps:
(1) charging current for reading charging pile in real time, in conjunction with the real-time temperature of battery management system (BMS) power battery acquired
Degree calculates real-time power battery acceptable temperature anomaly slope upper limit setting k during the charging processt_maxAnd lower limit set
kt_min,
kt_min_n=-0.5 (DEG C/min) (2)
In formula (1) and formula (2), kt_max_nIt is n-th of moment temperature anomaly slope upper limit, kt_min_nIt is n-th of moment temperature anomaly
Slope lower limit, Ic_nIt is the charging current at n-th of moment, INIt is the specified charging current of power battery, 0.5 is regulation coefficient；
K is set with the temperature anomaly slope upper limitt_maxWith lower limit set kt_minSlope guard interval [T as temperature changek_min,
Tk_max], had according to linear superposition theorem y=kx+b:
Tk_max_n=Tn-1+kt_max_n×(tn-tn-1)(℃) (3)
Tk_min_n=Tn-1+kt_min_n×(tn-tn-1)(℃) (4)
In formula (3) and formula (4), Tk_max_nIt is the temperature upper limit of n-th of moment exception slope protection, Tk_min_nIt is that n-th of moment is different
The lowest temperature of normal slope protection, Tn-1It is the temperature of (n-1)th moment power battery, tnRefer to n-th of moment, tn-1Refer to
N-1 moment；
(2) the acceptable highest battery temperature T for uploading the battery management system communication of power batteryc_maxWith minimum battery temperature
Tc_minAs temperature anomaly definite value upper and lower limit, it is set as the definite value protection temperature range [T of power batteryc_min, Tc_max]；
(3) by the slope guard interval [T of temperature changek_min, Tk_max] and definite value protection temperature range [Tc_min, Tc_max] carry out
Compare calculating, by [Tk_min, Tk_max] and [Tc_min, Tc_max] both temperature of the section as power battery in charging process that is overlapped
Degree should belong to section [Tmin, Tmax]。
6. charging pile control method according to claim 1, which is characterized in that the step 7 calculates power battery charged
State (SOC) should belong to section, comprising the following steps:
(1) the ampere-hour capacity increment of power battery charging is calculated:
In formula (5),Refer to from t0To tnThe charging ampere-hour capacity increment of power battery, t0Refer to charging initial time, Ic
(t) refer to the charging current of t moment；
tnState-of-charge (SOC) value of moment power battery:
In formula (6),Refer to tnThe SOC numerical value of moment power battery,Refer to t0The state-of-charge of moment power battery
(SOC) numerical value,Refer to from t0To tnState-of-charge (SOC) increment of power battery, ENRefer to the specified peace of power battery
Shi Rongliang；
The variation slope of power battery charged state (SOC) are as follows:
In formula (7), Ic(tn) refer to tnThe charging current at moment；
T is calculatednThe upper limit of moment state-of-charge (SOC) exception slopeAnd lower limitAre as follows:
In formula (8) and formula (9), ecFor the current sample error of charging pile, ebFor the current sample point tolerance of power battery, esFor
Error caused by the current sample point of charging pile is different from the current sample of power battery point position,
According to tnThe upper limit of moment state-of-charge (SOC) exception slopeAnd lower limitCalculate tnMoment is different
The SOC upper limit of normal slope protectionAnd lower limit
In formula (10) and formula (11),It is tnState-of-charge (SOC) upper limit of moment exception slope protection,It is tnState-of-charge (SOC) lower limit of moment exception slope protection, ks_maxIt (t) is the power battery charged shape of t moment
State (SOC) the exception slope upper limit, ks_mminIt (t) is the abnormal slope lower limit of t moment power battery charged state (SOC)；
With the abnormal slope upper limit k of power battery charged state (SOC)s_maxWith lower limit ks_mminSlope as temperature change is protected
Section [Sk_min, Sk_max]；
(2) by the abnormal definite value bound of the state-of-charge of power battery (SOC), it is set as area state-of-charge (SOC) of definite value protection
Between [Sc_min, Sc_max]；
(3) section state-of-charge (SOC) in the state-of-charge section (SOC) of slope protection and definite value protection is compared meter
It calculates, section [S should be belonged to using the section of coincidence as the state-of-charge (SOC) of power battery in charging processmin, Smax]。
7. charging pile control method according to claim 1, which is characterized in that the step 9 calculates filling for power battery
Piezoelectric voltage should belong to section, comprising the following steps:
(1) highest of power battery is allowed into total voltage and minimum permission voltage, the voltage zone as the protection of electric voltage exception definite value
Between [Vc_min, Vc_max]；
(2) judge that power battery is in constant current charging mode, it is acceptable to calculate power battery voltage under constant current charging mode
Variation slope upper limit kv_maxWith slope lower limit kv_min；
The variation slope k of power battery voltagev_nAre as follows:
In formula (12), V (i+1) indicates that the voltage of i+1 moment power battery, V (i) indicate i-th of moment power battery
Voltage, m are the sample frequency of voltage；
Setting voltage change slope lower limit is kv_min=0, voltage change slope upper limit kv_max_nAre as follows:
In formula (13), Δ t refers to the time interval of power battery voltage sample, and Δ SOC refers to power battery within the Δ t time
The variable quantity of SOC, Ic(n) refer to the charging current at n-th of moment, ENRefer to the specified ampere-hour capacity of power battery；
The upper voltage limit V that power battery is protected in n-th of moment slopek_max_nWith lower limit Vk_min_nIt is respectively as follows:
Vk_max_n=Vn-1+kv_max_n×Δt(V)； (14)
Vk_min_n=Vn-1+kv_min× Δ t=Vn-1(V) (15)
In formula (14) and formula (15), Vn-1 is the voltage sample value at (n-1)th moment,
By upper voltage limit Vk_max_nWith lower limit Vk_min_nVoltage range [V as slope protectionk_min, Vk_max]；
(3) voltage range for voltage range and the slope protection protected electric voltage exception definite value, is compared calculating, coincidence
Section should belong to section [V as the voltage of power battery in charging processmin, Vmax]。
8. charging pile control method according to claim 1, which is characterized in that the step 11 calculates power battery
Charging current should belong to section, comprising the following steps:
(1) the electric current section [I for allowing charging current and minimum charging current to protect as definite value the highest of power batteryc_min,
Ic_max]；
(2) judge that power battery is in constant-voltage charge mode, the variation slope k of power battery electric currenti_nAre as follows:
In formula (16), I (i+1) indicates that the electric current of i+1 moment power battery, I (i) indicate i-th of moment power battery
Electric current；
Curent change slope upper limit k is seti_max=0；The upper current limit I of slope protectionk_max_nWith the lower current limit of slope protection
Ik_min_nAre as follows:
Ik_max_n=In-1+ki_max_n× Δ t=In-1 (17)
Ik_min_n=0
The upper current limit I that slope is protectedk_max_nWith the lower current limit I of slope protectionk_min_nElectric current section as slope protection
[Ik_min, Ik_max]；
(3) by definite value protection electric current section and slope protection electric current section, be compared calculating, using the section of coincidence as
The electric current of power battery should belong to section [I in charging processmin, Imax]。
9. a kind of charging pile controller, it is characterised in that: the charging pile controller is equipped with communication management module, data store mould
Block, Logic control module, dual abnormal protection module and sampling module；
The communication management module is used to carry out the data of power battery and the state parameter of charging pile unitized management；It is described
Data allow total voltage, highest that monomer voltage, highest is allowed to permit for the highest that battery management system uploads to charging pile controller
Perhaps charging current, maximum permissible temperature, rated capacity, specified total voltage, total nominal energy, temperature definite value guard interval, initial
When state-of-charge (SOC), real-time voltage, real-time current, real time temperature, charging current instruction value, charging voltage instruction value, charging
Between, it is maximum temperature, minimum temperature, highest monomer voltage, ceiling voltage number, maximum temperature number, minimum temperature number, abnormal
Alarm status, current state-of-charge (SOC), remaining charging time；The state parameter is charging voltage, charging current, switch
State, malfunction；
The data memory module for being stored to charge information data, convenient for the unusual condition that charges data traceability and point
Analysis；The charge information data are that the highest of power battery allows total voltage, highest that monomer voltage, highest is allowed to allow the electricity that charges
Stream, maximum permissible temperature, rated capacity, specified total voltage, total nominal energy, temperature definite value guard interval, initial S state-of-charge
(SOC), real-time voltage, real-time current, real time temperature, charging current instruction value, charging voltage instruction value, charging time, highest
Temperature, minimum temperature, highest monomer voltage, ceiling voltage number, maximum temperature number, minimum temperature number, abnormality alarming shape
State, current state-of-charge (SOC), charging voltage, charging current, the charging pipette tips temperature, event in remaining charging time and charging pile
Barrier state；
The charging current instruction value and charging voltage that the Logic control module is issued according to the battery management system of power battery
Instruction value instruction, the power output of real-time control charging module；
The dual abnormal protection module realizes the detection of characteristic quantity anomaly trend and breakdown judge in charging process；
The sampling module real-time monitoring charging pile charging voltage, charging current and charging pipette tips temperature data information.
10. charging pile controller according to claim 9, it is characterised in that: the charging pile controller, which is equipped with encryption, to be recognized
Demonstrate,prove module, metering and billing module, power module and narration information active push module；
The encryption authentication module is used to recognize with the charging pile operation management system unit of charging pile communication interaction progress identity
Card, and the data of communication interaction are encrypted；
The metering and billing module is used to count the information about power in charging process；
The power module provides reliable and stable power supply supply for charging pile controller；
The fault message active push module is by the mobile phone of fault message active push to car owner.
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